Haskell: generate String representation of custom type

By using 'deriving Show' type class at the time of defining custom type, you can automatically generate default string representation for custom types. Show is a type class, by deriving it, you can get the string representation of type.

Example

data Employee = Engineer Int String String | Manager Int String String Double deriving Show

Prelude> data Employee = Engineer Int String String | Manager Int String String Double deriving Show 
Prelude> 
Prelude> let engineer1 = Engineer 1 "Hari Krishna" "Gurram"
Prelude> 
Prelude> let manager1 = Manager 1 "Vadi Raj" "Kulkarni" 12345678.23
Prelude> 
Prelude> show engineer1
"Engineer 1 \"Hari Krishna\" \"Gurram\""
Prelude> 
Prelude> show manager1
"Manager 1 \"Vadi Raj\" \"Kulkarni\" 1.234567823e7"
Prelude> 

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